Tie-rod tightener and puller for concrete forms



July 8, 1924. 1500,20 1 A. H. RICHARD TIE-ROD TIGHTENER AND FULLER FOR CONCRETE FORMS Filed July 19. 192! 2 Sheets-Sheet. l

/ INVENTOR ATTORNEYS WITNESSES A TTORNE Y 8 July 8, I924. A. H. RICHARD us no!) TIGHTENER AND FULLER FOR coucnmm FORMS WITNESSES Patented July 8, 1924.

the pouring operation and unt-il'the concrete 1 1,500,204 PATENT oF cuu ANTHONY HENRY RICHARD, OF -A 1EXANDBIA, LOUISIANA.

Tin-Ron TIGHTEN'ER AND PUIIII'ER non" o'oN oR'ETEroRMs.

Application filed mg '19, 192 -1. Seri'aI No'. 485,902.

' To all whom it may concern? Be it known that I, ANTHONY H. RICHARD, a citizen of the United States, residing at Alexandria, in the parish of Rapid'es and State of Louisiana, have invented certain new and useful Improvements in Tie-Rod Tighteners and Pullers for Concrete Forms, of which the following is a specification.

This invention relates'to a tightener and puller, used in connection with the tie rods used in concrete wall constructlont In the method of concrete construction wherein my invention is used, steel tie rods are employed for tying the opposed mold boards or plates together prior to and'durin'g has sufficiently set to permit of the'removal of the form.

It is found more'economicalto pull the rods out of the wall sothat they may be used over and over again, than-it is'to leavethem in the wall and cutoff the projecting ends of such rods. It is, however, a difficult matter to pull out cleanly; these rods unless an effectual instrument or tool-is employed.

An object of this invention is toprovide a simple and efficient tool for tightening the rod and drawing the members of the forms together; 7

Another object isto provide a highly efficient yet comparatively simple and cheap device which may be conveniently used for pulling the tie rods from'concreteconstruc tion. 7 V

With these and other objects in view my invention consists incertain novel featuresof construction, arrangement and combina'-- tion of parts, as will be hereinafter clearly set forth and pointed out in the claims, reference being had totheaccompanying drawings forming a part hereof, in'which Figure 1 is a perspective View showing my invention as in use.

t Figure 2 is central longitudinal section with parts broken to decrease length. Figure .3 is a transverse section on line' 3-3 of Figure 2.

Figure 4 is a grouped perspective of several of the parts of-the' device- The tool as herein embodied consists primarily of two tubular members such members in the present instance including outer and inner steel cylinders 5 and 6, cylinder 5 having a smooth central bore at its front end, and a counterbore rearwardly thereof which is'threaded'and intothis is screwed the inner stee'lcylinder'6 having a central b'o'r'e7, but not threaded, the cylinder 6' being provided withan external thread; At itsouter en'd themember 6 is. provided with spaced apart perforatedears'or lugs'8 between which a serratedcam 9 is mounted on a pivot 10.

At its forward or inner end the cylinder 5 is provided with a shouldered recess to receive a thrust bearing consisting ofa grooved washer or-ring11, a series of balls 12, another grooved washer or ring 13, anda rotative nose member 14', said member having a smooth central bore 15 'anda reduced front extensionl6, the outer face 17 of which is a bearing face whiletherear or inner face is abut-ted by the washer 1 3.

The nose member 14 is removable as a unit and is adjustably' and removably held in contact with the bearing by a'colla'r nut 18 which screws on member 5 and is itself holdin;

locked position by a lock washer nut 19.

At any suitable point intermediate; its

ends, -but generally at about its longitudinal center the member 5 is provided withmeans for scre'wing the-members 5 and 6 together I signed to house spring-controlled p'awls 26,

each pawl has a projecting nose or tooth at its inner end and is pivotally carried by a transverse pin 2? which passes through the extensions '24. The paw ls are also ea'ch pro- V vided near the; outer endwith a lateral projec'tion 28fhaving in one sideface a semispherical "recess 29 into which a small sphere or b'all 3'0 may-seat; thesebalIsBO are disposed in f lateralpassage inthe extensions 24: and are forced toward the pawls or dogs by springs 31 held in the passage by set screws 31. To give the ratchet effect to the dogs'or pawls, a small plunger 32 backed by a coil spring 33 is used, the coiled springs being seated in a passage in the extensions 24, and held therein by set screws 34:, by which the tensionof the springs can also be regulated.

These plungers are so positioned that their rounded ends bear against the dogs or pawls intermediate their pivots" and their outer ends and hereby permit a rocking movement of the dogs or pawls.

The tendency of the plungers is to always.

throw the inner ends or noses of the dogs into engagement with the teeth 20 on the tubular member 5, but they may be thrown out of action and held passive by forcing the outer ends of the dogs 26 against the plungers 32 and force of springs 33 until the semispherical recesses 29 are in alinement with the balls or spheres 30, whereupon the said balls fall into the said recesses 29 and thus hold the dogs or pawls out of engagement with teeth 20.

Upon the shank 22 is secured a handle 22 which has a socket at one end fitting over said shank and held rigidly thereto by a bolt or rivet 22 passed through both of them and the handle is held against lateral movement by a ring or plate 22.

The manner of using the tool is as follows:

The form having been set up and the tie rods R having been passed through the forms, the tool as a unit is slipped on the projecting end of the rod R and the rotative nose 14 placed in contact with one of the mold or form boards, the cam lever being in the position shown in Figures 1 and 2; the lever is then swung to the right from its position shown in Fig. 1, whereupon the serrations bite into the rod. The ratchet brace is then brought into action rotating the member 5; this causes the inner tubular member 6 to move longitudinally out of cylinder 5 as the nose bears tightly against the form board and the cam lever tightly gripping the rod prevents the cylinder 6 from rotating relatively to it, hence the cylinder 6 must move longitudinally and pull the rod with it thus tightening it.

The rod may be pulled from the form when it has set to the degree of hardness, by releasing its opposite end of all clamping means and continuously working the ratchet mechanism until the inner cylinder 6 is almost entirely, projected. from the cylinder 5 at the right; then byreleasing the cam lever the tool can then be slid back to the left on the rod R and the parts restored to their original positions as in the beginning, the cam lever again locked to the rod, and the same operation carried out by the ratchet mechanism; and so on until the entire rod is withdrawn.

It will of course be understood that the tool can be used directly against the concrete wall itself after the form boards have been removed.

As the nose 14 is swiveled to the forward or inner end of member 5'and projects well beyond the same, it forms the bearing member against the concrete, and the member 5 can be readily rotated by the ratchet brace to cause the member 6 to telescope in or out of the same.

It should also be noted that the tool can be used to tighten outside rods which are commonly used with outside clamp bars, and with the ordinary clamp nuts used with such rods, which nuts are'generally held in their place by set screws.

I claim 1. A tool as herein set forth comprising inner and outer cylindrical members, the outer member internally threaded and inner member externally threaded, and adapted to move longitudinally within the internally threaded outer member, means carried at the rear end of the inner member for releasably looking it to the tie rod, a thrust bearing assembly projecting beyond the front end of the outer member, said assembly member comprising a swivelly mounted nose portion having a smooth central bore, and an annular external shoulder, a threaded collar nut mounted on the front end of the outer cylindrical member and adjustably holding said nose portion at the end of said outer member, a lock nut washer controlling said collar nut, and an antifriction ball race interposed between said nose portion and the front end of the outer cylindrical member.

2. The combination with an externally threaded inner tubular member, of a serrated cam lever carried at the rear end of said member, an internallythreaded outer tubular member threaded onto said inner member, a forwardly projecting nose member constituting a form or concrete body engaging and bearing member swivelly mounted at the front end of the said outer tubular member, said nose member having a smooth central bore, and ratchet and pawl means encircling the outer member to impart reciprocal rotary movement thereto to project the inner tubular member longitu dinally into and out of the said outer member.

ANTHONY HENRY RICHARD. 

